fork: use vma_pages() to simplify the code
authorHuang Shijie <shijie8@gmail.com>
Mon, 30 Jul 2012 21:42:30 +0000 (14:42 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Tue, 31 Jul 2012 00:25:20 +0000 (17:25 -0700)
The current code can be replaced by vma_pages().  So use it to simplify
the code.

[akpm@linux-foundation.org: initialise `len' at its definition site]
Signed-off-by: Huang Shijie <shijie8@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

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